英语首字母填空The results are e______ more serious:For where there

英语首字母填空
The results are e______ more serious:For where there are trees,there roots(根) prevent the rain from washing away the soil ,but there are no trees,the rian falls on hard g______and folws away,causing f______ and carrying away the rich top-soil.when all the top-soil(地表土)is gone,nothing remains(剩下)but death.